linux/drivers/dma/shdma.h
Magnus Damm b2623a61cf dmaengine: shdma: Introduce include/linux/sh_dma.h
Create a common platform data header file for the
shdma dmaengine driver. This is done by moving
common structures from sh asm/dmaengine.h to
linux/sh_dma.h. DMA registers are also copied from
sh asm/dma-register.h to make the code architecture
independent.

The sh header file asm/dmaengine.h is still kept
with the slave id enum. This allows us to keep the
old processor specific code as is and slowly move
over to slave id enums in per-processor headers.

Signed-off-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2010-03-23 17:20:06 +09:00

54 lines
1.7 KiB
C

/*
* Renesas SuperH DMA Engine support
*
* Copyright (C) 2009 Nobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com>
* Copyright (C) 2009 Renesas Solutions, Inc. All rights reserved.
*
* This is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
*/
#ifndef __DMA_SHDMA_H
#define __DMA_SHDMA_H
#include <linux/dmaengine.h>
#include <linux/interrupt.h>
#include <linux/list.h>
#define SH_DMAC_MAX_CHANNELS 6
#define SH_DMA_SLAVE_NUMBER 256
#define SH_DMA_TCR_MAX 0x00FFFFFF /* 16MB */
struct device;
struct sh_dmae_chan {
dma_cookie_t completed_cookie; /* The maximum cookie completed */
spinlock_t desc_lock; /* Descriptor operation lock */
struct list_head ld_queue; /* Link descriptors queue */
struct list_head ld_free; /* Link descriptors free */
struct dma_chan common; /* DMA common channel */
struct device *dev; /* Channel device */
struct tasklet_struct tasklet; /* Tasklet */
int descs_allocated; /* desc count */
int xmit_shift; /* log_2(bytes_per_xfer) */
int irq;
int id; /* Raw id of this channel */
u32 __iomem *base;
char dev_id[16]; /* unique name per DMAC of channel */
};
struct sh_dmae_device {
struct dma_device common;
struct sh_dmae_chan *chan[SH_DMAC_MAX_CHANNELS];
struct sh_dmae_pdata *pdata;
u32 __iomem *chan_reg;
u16 __iomem *dmars;
};
#define to_sh_chan(chan) container_of(chan, struct sh_dmae_chan, common)
#define to_sh_desc(lh) container_of(lh, struct sh_desc, node)
#define tx_to_sh_desc(tx) container_of(tx, struct sh_desc, async_tx)
#endif /* __DMA_SHDMA_H */